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UNITED STATES PATENT OEEICE.

CHARLES M. BURGESS, OF NEW BRITAIN, CONNECTICUT, A SSIGNOR TO THE RUSSELL da ERVIN MANUFACTURING COMPANY, OF SAME PLACE.

LOCK-CASE.

SPECIFICATION forming part of Letters Patent No. 425,748, dated April 15, 1890.

Application filed .Tanuary 27| 1890. Serial No. 338,206. (No model.)

To @ZZ whom it may concern: y

Be it known that I, CHARLES M. BURGESS, a citizen of the United States, residing at New Britain, in the lcounty of Hartford and State of Connecticut, have invented certain new and useful Improvements in Latch or Lock Jgases, of which the following is a specifica- My invention relates to improvements in latch or lock cases; and the objects of myimprovement are to more conveniently and securely attach the cap-plate.

In the accompanying drawings, Figure lis an end View of my latch or lock case looking on the face-plate. Fig. 2 is an end view as viewed in the opposite direction. Fig. 3 is a rear view with a part of the face-plate in section on the line so of Fig. 1. Fig. 4 is avertical section of my case on the line y y of Fig. 3. Figs. 5, 6, and 7 represent, respectively, views corresponding with Figs. 1, 2, and 3 of mylatch or lock case in a modied form.

The invention is primarily intended for that class of latch or lock cases which are known as rim latches or locks, but it is evident that if the rear plate or cap were attached in the same manner in any other class of cases my invention would not be avoided.

A designates the body of the latch or lock case, which is substantially in a box-like form with a face-plate 8 at the front end, in which I the usual mortises for the latch and lock bolts are form ed. I prefer to strike the body of the case up from sheet metal; but the manner of forming the body of the case, as to its 'general form, is not a part of my present invention.

I form in the face-plate 8 two mortises 9 9 and at the rear edge of the back end a recess l0, and I form the rear plate or cap-plate B with corresponding projections or mortises ll l2. It is evidentthat when said mortises and recesses and lugs or tenons are merely plain or simple holes and projections, as shown in Figs. 5, 6, and 7 the rear plate or cap Bgwill be held against moving from front to rear at the front end, so vthat by merely riveting the metal in the body of the case on each side of the projection 12 the cap or plate will be held in place without the aid of a cap-screw. It is, however, sometimes desirable to make the rear plate or cap B serve as a binder to prevent the ends of the case from spreading outwardly, or, in other words, to firmly hold the face-plate at the front end of the case by tying it to the opposite or back end. Such a re 55 sult may be accomplished by riveting or heading the outer ends of the plain lugs. (Shown in Figs. 5, 6, and 7.) In order to accomplish such a result with a readily attachableo and detachable rear or cap plate, I swage the metal 6o in the face-plate inwardly at points above the mortises 9 9, thereby forming a depression or socket 13 immediately above each of the mortises 9, as shown in Figs. l, 3, and 4. These sockets I prefer to have of a depth fully equal to the thickness of the plate or cap B, and I bend th'e outer ends of the tenons l1 into a hooked form, so that after passing through the mortises 9 they may extend into the sockets 13 and secure the plate B and face-plate 8 against moving away from each other. I also form a recess or socket 14 upon each side of the 'recess 10, and I make the outer end of the tenon 12 of a T or L form, so as to engage said sockets and also lock the plate to that end of the case, in addition to the riveting before mentioned. I prefer to make the sockets 14 and the tenon 12 of such respective depth and length that the end of the tenon will be flush with the back end of the case, as shown in Figs. 3 and 4. The lug or tenon 12 is made of T form, with sockets on each side for the sake of symmetry; but an overhanging tenon of other form-for instance, one having a proj ection and socket on one side only of said tenon-would be an equivalent lock for binding the ends of the case together. From this construction it will be seen that in both forms of cases shown the rear plate or cap B is held upon the case without a cap-screw by means of recesses upon one part and projections upon the other, and is held there by merely riveting or hammering down the metal at one end of the case only, and in addition thereto the opposite ends of the case are or may be iirmly tied together by means of the rear plate or cap B. While the cap-screw is unnecessary, it is evident that my invention would not be avoided by the use of the ordinary cap-screw.

I claim as my invention-` Y IOO 1. The herein-described latch or lock case, consisting, essentially, of a box-like body with a face-plate 8 at its front end, having mortises, and the back end opposite said face-plate hav-y ing a recess in its edge, and the rear or cap plate B, having lugs or tenons at one end to engage said mortises' in said face-plate and lthe lug or tenon at the opposite end to engage 14 by the sides thereof, and the corresponding end of the rear plate or cap B having an overhanging-shaped tenon fitted to said recess andA sockets, substantially as described, and for the purpose specified;

4. The herein-described latch or lock case, consisting of a box-like body having the InortisesQ 9 and adjacent sockets 13 13 in its faceplate, the recess and socket 14 at its back end, and the rear plate or cap B, havin g'hooked and overhan ging tenons fitted to said body, substantially as described, and for the purpose specified.

5. The herein-described latch or lock case,

consisting of a box-like body and rear plate or cap having, respectively, engaging mortises and tenons, whereby said rear plate or cap serves as atie for binding together the front and back ends of said box-like body, substantially as described, and for thepurpose specilied.

(1I-IAS. M. BURGESS.

Witnesses:

T. S. BISHOP, M. S. WIARD. 

